Two U.S. soldiers were killed and another six injured on Friday afternoon when a military vehicle struck them at the Fort Jackson military base in South Carolina. Fort Jackson officials said two of those injured were in critical condition after the “tragic accident.” No further details have been released on the type of military vehicle involved. Officials said only that the soldiers were in military formation on the base when they were hit. The names of the soldiers killed will be released after their families are notified, authorities said. An investigation into the incident is underway.